A major environmental milestone has quietly unfolded on Auckland’s remote east coast, but it’s likely one that barely left a ripple in the public conscience. But it could mean the difference between survival and extinction for one of New Zealand’s most endangered native birds, the tara iti (fairy tern).
Auckland Council has led a successful effort to restore the natural connection between Te Arai Stream and two dune lakes inland, Lakes Slipper and Spectacle, both critical feeding grounds for native fish and the fairy tern, which relies on these fish to survive.
The project was funded through Auckland Council’s Natural Environment Targeted Rate, which supports environmental protection and restoration work across the region.
While most bridge and road projects aim to speed up human travel, this project had a very different goal: to help native fish swim freely upstream again and, in doing so, help save a species on the brink.
“For the tara iti, every fish counts,” says Matt Bloxham, Auckland Council’s senior freshwater advisor. “There are only 11 breeding females left in the wild. If they can’t access fish-rich areas like these lakes, we risk losing them forever.”
At the centre of the problem was a culvert beneath Te Arai Point Road. Known locally as ‘Coulters Culvert No. 2’, it had long blocked fish like inanga, a key whitebait species, from reaching the lakes. Erosion beneath the pipe created a sharp drop that native fish, unlike salmon, simply can’t jump.
“Native fish don’t have the leaping ability people might imagine,” Bloxham explains. “Even a small drop or protruding pipe becomes a brick wall for species like inanga.”
This isn’t an isolated issue. Across New Zealand, thousands of small, poorly designed culverts block access to kilometres of freshwater habitat, rendering them lifeless despite appearing healthy from above.
What makes this Te Arai project exceptional is that it was pre-emptive.
“Usually, action happens only after infrastructure fails,” says Bloxham.
“But with tara iti, time is too precious. We couldn’t wait for the culvert to collapse; we had to act now.”
The result is a new box culvert, purpose-built to support fish passage, and barely noticeable to the beachgoers and surfers who travel the road to Te Arai Regional Park. But for native fish, and the tara iti who feed on them, the difference is monumental.
This project is part of a broader ecological restoration driven by the local iwi, Te Uri o Hau, who have revegetated more than 1.3 kilometres of the Te Arai Stream. All native plants were grown from seed in their nursery, creating a thriving buffer zone to support aquatic life.
“It’s a quiet achievement in a quiet place,” Bloxham says, “but it’s the kind of work that underpins the survival of species and the health of our ecosystems. It’s restoration at its most meaningful.”
As roads get busier and nature more fragmented, projects like this show how infrastructure can work with the environment, not against it, giving native species, including one of the rarest birds in the world, a fighting chance.